src/gallium/auxiliary/util/u_format.h

   1 /**************************************************************************
   2  *
   3  * Copyright 2009 Vmware, Inc.
   4  * All Rights Reserved.
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   7  * copy of this software and associated documentation files (the
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  11  * permit persons to whom the Software is furnished to do so, subject to
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  13  *
  14  * The above copyright notice and this permission notice (including the
  15  * next paragraph) shall be included in all copies or substantial portions
  16  * of the Software.
  17  *
  18  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  19  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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  27
  28
  29 #ifndef U_FORMAT_H
  30 #define U_FORMAT_H
  31
  32
  33 #include "pipe/p_format.h"
  34 #include "util/u_debug.h"
  35
  36 #ifdef __cplusplus
  37 extern "C" {
  38 #endif
  39
  40
  41 /**
  42  * Describe how to best pack/unpack pixels into/from the prescribed format.
  43  *
  44  * These are used for automatic code generation of pixel packing and unpacking
  45  * routines (in compile time, e.g., u_format_access.py, or in runtime, like
  46  * llvmpipe does).
  47  *
  48  * Thumb rule is: if you're not code generating pixel packing/unpacking then
  49  * these are irrelevant for you.
  50  *
  51  * Note that this can be deduced from other values in util_format_description
  52  * structure. This is by design, to make code generation of pixel
  53  * packing/unpacking/sampling routines simple and efficient.
  54  *
  55  * XXX: This should be renamed to something like util_format_pack.
  56  */
  57 enum util_format_layout {
  58    /**
  59     * Single scalar component.
  60     */
  61    UTIL_FORMAT_LAYOUT_SCALAR = 0,
  62
  63    /**
  64     * One or more components of mixed integer formats, arithmetically encoded
  65     * in a word up to 32bits.
  66     */
  67    UTIL_FORMAT_LAYOUT_ARITH = 1,
  68
  69    /**
  70     * One or more components, no mixed formats, each with equal power of two
  71     * number of bytes.
  72     */
  73    UTIL_FORMAT_LAYOUT_ARRAY = 2,
  74
  75    /**
  76     * XXX: Not used yet. These might go away and be replaced by a single entry,
  77     * for formats where multiple pixels have to be
  78     * read in order to determine a single pixel value (i.e., block.width > 1
  79     * || block.height > 1)
  80     */
  81    UTIL_FORMAT_LAYOUT_YUV = 3,
  82    UTIL_FORMAT_LAYOUT_DXT = 4
  83 };
  84
  85
  86 struct util_format_block
  87 {
  88    /** Block width in pixels */
  89    unsigned width;
  90
  91    /** Block height in pixels */
  92    unsigned height;
  93
  94    /** Block size in bits */
  95    unsigned bits;
  96 };
  97
  98
  99 enum util_format_type {
 100    UTIL_FORMAT_TYPE_VOID = 0,
 101    UTIL_FORMAT_TYPE_UNSIGNED = 1,
 102    UTIL_FORMAT_TYPE_SIGNED = 2,
 103    UTIL_FORMAT_TYPE_FIXED = 3,
 104    UTIL_FORMAT_TYPE_FLOAT = 4
 105 };
 106
 107
 108 enum util_format_swizzle {
 109    UTIL_FORMAT_SWIZZLE_X = 0,
 110    UTIL_FORMAT_SWIZZLE_Y = 1,
 111    UTIL_FORMAT_SWIZZLE_Z = 2,
 112    UTIL_FORMAT_SWIZZLE_W = 3,
 113    UTIL_FORMAT_SWIZZLE_0 = 4,
 114    UTIL_FORMAT_SWIZZLE_1 = 5,
 115    UTIL_FORMAT_SWIZZLE_NONE = 6
 116 };
 117
 118
 119 enum util_format_colorspace {
 120    UTIL_FORMAT_COLORSPACE_RGB = 0,
 121    UTIL_FORMAT_COLORSPACE_SRGB = 1,
 122    UTIL_FORMAT_COLORSPACE_YUV = 2,
 123    UTIL_FORMAT_COLORSPACE_ZS = 3
 124 };
 125
 126
 127 struct util_format_channel_description
 128 {
 129    unsigned type:6;
 130    unsigned normalized:1;
 131    unsigned size:9;
 132 };
 133
 134
 135 struct util_format_description
 136 {
 137    enum pipe_format format;
 138    const char *name;
 139    struct util_format_block block;
 140    enum util_format_layout layout;
 141    struct util_format_channel_description channel[4];
 142    unsigned char swizzle[4];
 143    enum util_format_colorspace colorspace;
 144 };
 145
 146
 147 extern const struct util_format_description
 148 util_format_description_table[];
 149
 150
 151 const struct util_format_description *
 152 util_format_description(enum pipe_format format);
 153
 154
 155 /*
 156  * Format query functions.
 157  */
 158
 159 static INLINE boolean
 160 util_format_is_compressed(enum pipe_format format)
 161 {
 162    const struct util_format_description *desc = util_format_description(format);
 163
 164    assert(format);
 165    if (!format) {
 166       return FALSE;
 167    }
 168
 169    return desc->layout == UTIL_FORMAT_LAYOUT_DXT ? TRUE : FALSE;
 170 }
 171
 172 static INLINE boolean
 173 util_format_is_depth_or_stencil(enum pipe_format format)
 174 {
 175    const struct util_format_description *desc = util_format_description(format);
 176
 177    assert(format);
 178    if (!format) {
 179       return FALSE;
 180    }
 181
 182    return desc->colorspace == UTIL_FORMAT_COLORSPACE_ZS ? TRUE : FALSE;
 183 }
 184
 185 static INLINE boolean
 186 util_format_is_depth_and_stencil(enum pipe_format format)
 187 {
 188    const struct util_format_description *desc = util_format_description(format);
 189
 190    assert(format);
 191    if (!format) {
 192       return FALSE;
 193    }
 194
 195    if (desc->colorspace != UTIL_FORMAT_COLORSPACE_ZS) {
 196       return FALSE;
 197    }
 198
 199    return (desc->swizzle[0] != UTIL_FORMAT_SWIZZLE_NONE &&
 200            desc->swizzle[1] != UTIL_FORMAT_SWIZZLE_NONE) ? TRUE : FALSE;
 201 }
 202
 203
 204 /**
 205  * Return total bits needed for the pixel format per block.
 206  */
 207 static INLINE uint
 208 util_format_get_blocksizebits(enum pipe_format format)
 209 {
 210    const struct util_format_description *desc = util_format_description(format);
 211
 212    assert(format);
 213    if (!format) {
 214       return 0;
 215    }
 216
 217    return desc->block.bits;
 218 }
 219
 220 /**
 221  * Return bytes per block (not pixel) for the given format.
 222  */
 223 static INLINE uint
 224 util_format_get_blocksize(enum pipe_format format)
 225 {
 226    uint bits = util_format_get_blocksizebits(format);
 227
 228    assert(bits % 8 == 0);
 229
 230    return bits / 8;
 231 }
 232
 233 static INLINE uint
 234 util_format_get_blockwidth(enum pipe_format format)
 235 {
 236    const struct util_format_description *desc = util_format_description(format);
 237
 238    assert(format);
 239    if (!format) {
 240       return 1;
 241    }
 242
 243    switch (desc->layout) {
 244    case UTIL_FORMAT_LAYOUT_YUV:
 245       return 2;
 246    case UTIL_FORMAT_LAYOUT_DXT:
 247       return 4;
 248    default:
 249       return 1;
 250    }
 251 }
 252
 253 static INLINE uint
 254 util_format_get_blockheight(enum pipe_format format)
 255 {
 256    const struct util_format_description *desc = util_format_description(format);
 257
 258    assert(format);
 259    if (!format) {
 260       return 1;
 261    }
 262
 263    switch (desc->layout) {
 264    case UTIL_FORMAT_LAYOUT_DXT:
 265       return 4;
 266    default:
 267       return 1;
 268    }
 269 }
 270
 271 static INLINE unsigned
 272 util_format_get_nblocksx(enum pipe_format format,
 273                          unsigned x)
 274 {
 275    unsigned blockwidth = util_format_get_blockwidth(format);
 276    return (x + blockwidth - 1) / blockwidth;
 277 }
 278
 279 static INLINE unsigned
 280 util_format_get_nblocksy(enum pipe_format format,
 281                          unsigned y)
 282 {
 283    unsigned blockheight = util_format_get_blockheight(format);
 284    return (y + blockheight - 1) / blockheight;
 285 }
 286
 287 static INLINE unsigned
 288 util_format_get_nblocks(enum pipe_format format,
 289                         unsigned width,
 290                         unsigned height)
 291 {
 292    return util_format_get_nblocksx(format, width) * util_format_get_nblocksy(format, height);
 293 }
 294
 295 static INLINE size_t
 296 util_format_get_stride(enum pipe_format format,
 297                        unsigned width)
 298 {
 299    return util_format_get_nblocksx(format, width) * util_format_get_blocksize(format);
 300 }
 301
 302 static INLINE size_t
 303 util_format_get_2d_size(enum pipe_format format,
 304                         size_t stride,
 305                         unsigned height)
 306 {
 307    return util_format_get_nblocksy(format, height) * stride;
 308 }
 309
 310 static INLINE uint
 311 util_format_get_component_bits(enum pipe_format format,
 312                                enum util_format_colorspace colorspace,
 313                                uint component)
 314 {
 315    const struct util_format_description *desc = util_format_description(format);
 316    enum util_format_colorspace desc_colorspace;
 317
 318    assert(format);
 319    if (!format) {
 320       return 0;
 321    }
 322
 323    assert(component < 4);
 324
 325    /* Treat RGB and SRGB as equivalent. */
 326    if (colorspace == UTIL_FORMAT_COLORSPACE_SRGB) {
 327       colorspace = UTIL_FORMAT_COLORSPACE_RGB;
 328    }
 329    if (desc->colorspace == UTIL_FORMAT_COLORSPACE_SRGB) {
 330       desc_colorspace = UTIL_FORMAT_COLORSPACE_RGB;
 331    } else {
 332       desc_colorspace = desc->colorspace;
 333    }
 334
 335    if (desc_colorspace != colorspace) {
 336       return 0;
 337    }
 338
 339    switch (desc->swizzle[component]) {
 340    case UTIL_FORMAT_SWIZZLE_X:
 341       return desc->channel[0].size;
 342    case UTIL_FORMAT_SWIZZLE_Y:
 343       return desc->channel[1].size;
 344    case UTIL_FORMAT_SWIZZLE_Z:
 345       return desc->channel[2].size;
 346    case UTIL_FORMAT_SWIZZLE_W:
 347       return desc->channel[3].size;
 348    default:
 349       return 0;
 350    }
 351 }
 352
 353 static INLINE boolean
 354 util_format_has_alpha(enum pipe_format format)
 355 {
 356    const struct util_format_description *desc = util_format_description(format);
 357
 358    assert(format);
 359    if (!format) {
 360       return FALSE;
 361    }
 362
 363    switch (desc->layout) {
 364    case UTIL_FORMAT_LAYOUT_SCALAR:
 365    case UTIL_FORMAT_LAYOUT_ARITH:
 366    case UTIL_FORMAT_LAYOUT_ARRAY:
 367       /* FIXME: pf_get_component_bits( PIPE_FORMAT_A8L8_UNORM, PIPE_FORMAT_COMP_A ) should not return 0 right? */
 368       if (format == PIPE_FORMAT_A8_UNORM ||
 369           format == PIPE_FORMAT_A8L8_UNORM ||
 370           format == PIPE_FORMAT_A8L8_SRGB) {
 371          return TRUE;
 372       }
 373       return util_format_get_component_bits(format, UTIL_FORMAT_COLORSPACE_RGB, 3) != 0;
 374    case UTIL_FORMAT_LAYOUT_YUV:
 375       return FALSE;
 376    case UTIL_FORMAT_LAYOUT_DXT:
 377       switch (format) {
 378       case PIPE_FORMAT_DXT1_RGBA:
 379       case PIPE_FORMAT_DXT3_RGBA:
 380       case PIPE_FORMAT_DXT5_RGBA:
 381       case PIPE_FORMAT_DXT1_SRGBA:
 382       case PIPE_FORMAT_DXT3_SRGBA:
 383       case PIPE_FORMAT_DXT5_SRGBA:
 384          return TRUE;
 385       default:
 386          return FALSE;
 387       }
 388    default:
 389       assert(0);
 390       return FALSE;
 391    }
 392 }
 393
 394
 395 /*
 396  * Format access functions.
 397  */
 398
 399 void
 400 util_format_read_4f(enum pipe_format format,
 401                     float *dst, unsigned dst_stride,
 402                     const void *src, unsigned src_stride,
 403                     unsigned x, unsigned y, unsigned w, unsigned h);
 404
 405 void
 406 util_format_write_4f(enum pipe_format format,
 407                      const float *src, unsigned src_stride,
 408                      void *dst, unsigned dst_stride,
 409                      unsigned x, unsigned y, unsigned w, unsigned h);
 410
 411 void
 412 util_format_read_4ub(enum pipe_format format,
 413                      uint8_t *dst, unsigned dst_stride,
 414                      const void *src, unsigned src_stride,
 415                      unsigned x, unsigned y, unsigned w, unsigned h);
 416
 417 void
 418 util_format_write_4ub(enum pipe_format format,
 419                       const uint8_t *src, unsigned src_stride,
 420                       void *dst, unsigned dst_stride,
 421                       unsigned x, unsigned y, unsigned w, unsigned h);
 422
 423 #ifdef __cplusplus
 424 } // extern "C" {
 425 #endif
 426
 427 #endif /* ! U_FORMAT_H */